13664899 has 4 divisors (see below), whose sum is σ = 13679680. Its totient is φ = 13650120.

The previous prime is 13664897. The next prime is 13664909. The reversal of 13664899 is 99846631.

13664899 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99846631 = 227 ⋅439853.

It is a cyclic number.

It is not a de Polignac number, because 13664899 - 2¹ = 13664897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13664891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5904 + ... + 7885.

It is an arithmetic number, because the mean of its divisors is an integer number (3419920).

Almost surely, 2^13664899 is an apocalyptic number.

13664899 is a deficient number, since it is larger than the sum of its proper divisors (14781).

13664899 is an equidigital number, since it uses as much as digits as its factorization.

13664899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14780.

The product of its digits is 279936, while the sum is 46.

The square root of 13664899 is about 3696.6064167017. The cubic root of 13664899 is about 239.0757216462.

The spelling of 13664899 in words is "thirteen million, six hundred sixty-four thousand, eight hundred ninety-nine".